//! Integration tests for M3.8 Context Optimizer
//!
//! Tests the full 4-stage pipeline: Detection → Compression → CCR → Integration

use mem_core::{ContextOptimizer, ContextOptimizerConfig, ContentType};

#[test]
fn test_optimizer_detects_json() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");
    let json = r#"{"status": "success", "count": 42, "items": [1, 2, 3]}"#;

    let result = optimizer.optimize(json).expect("optimize failed");
    assert_eq!(result.content_type, ContentType::Json);
    assert!(result.original_tokens > 0);
}

#[test]
fn test_optimizer_detects_log() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");
    let log = "ERROR: connection timeout at 2026-08-28T09:15:00Z\n  at main.rs:42";

    let result = optimizer.optimize(log).expect("optimize failed");
    assert_eq!(result.content_type, ContentType::Log);
}

#[test]
fn test_optimizer_detects_code() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");
    let code = r#"
fn main() {
    println!("hello");
}
    "#;

    let result = optimizer.optimize(code).expect("optimize failed");
    assert_eq!(result.content_type, ContentType::Code);
}

#[test]
fn test_optimizer_compresses_npm_logs() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");

    let npm_log = r#"
npm WARN deprecated info@0.8.0: package no longer supported
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.3.2
npm notice created a lockfile as package-lock.json.
npm ERR! 404 Not Found - GET https://registry.npmjs.org/react@99.0.0
npm ERR! 404
npm ERR!  It is likely you are behind a proxy.
npm ERR! A complete log of this error:
npm ERR! /home/user/.npm/_logs/error.log
    "#;

    let result = optimizer.optimize(npm_log).expect("optimize failed");

    // Should detect as log
    assert_eq!(result.content_type, ContentType::Log);

    // Should compress
    assert!(result.compressed_tokens < result.original_tokens);

    // Should keep error markers
    assert!(result.compressed.to_lowercase().contains("npm err!"));
    assert!(result.compressed.contains("404"));

    // Should drop noise
    assert!(!result.compressed.contains("WARN deprecated"));
    assert!(!result.compressed.contains("notice created"));
}

#[test]
fn test_optimizer_handles_json_array() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");

    let json_array = r#"
[
  {"id": 1, "name": "Alice", "status": "active"},
  {"id": 2, "name": "Bob", "status": "inactive"},
  {"id": 3, "name": "Charlie", "status": "active"},
  {"id": 4, "name": "Diana", "status": "active"}
]
    "#;

    let result = optimizer.optimize(json_array).expect("optimize failed");

    // Should detect JSON
    assert_eq!(result.content_type, ContentType::Json);
    assert!(result.original_tokens > 0);
}

#[test]
fn test_optimizer_detects_diff() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");

    let diff = r#"--- a/config.yaml
+++ b/config.yaml
@@ -1,3 +1,3 @@
 server:
   host: localhost
-  port: 8080
+  port: 9000
    "#;

    let result = optimizer.optimize(diff).expect("optimize failed");
    assert_eq!(result.content_type, ContentType::Diff);
}

#[test]
fn test_optimizer_passthrough_when_disabled() {
    let config = ContextOptimizerConfig {
        enabled: false,
        ..Default::default()
    };
    let optimizer = ContextOptimizer::with_config(config).expect("failed to create optimizer");

    let content = "ERROR: something failed";
    let result = optimizer.optimize(content).expect("optimize failed");

    // Should be unchanged
    assert_eq!(result.compressed, content);
    assert_eq!(result.original_tokens, result.compressed_tokens);
}

#[test]
fn test_optimizer_with_compression_disabled() {
    let config = ContextOptimizerConfig {
        enabled: true,
        compress_logs: false,
        ..Default::default()
    };
    let optimizer = ContextOptimizer::with_config(config).expect("failed to create optimizer");

    let log = "ERROR: connection timeout\nWARN: slow response\nINFO: connected";
    let result = optimizer.optimize(log).expect("optimize failed");

    // Should be unchanged since compression is disabled
    assert_eq!(result.compressed, log);
}

#[test]
fn test_optimizer_token_counting() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");

    let short = "hello world";
    let short_result = optimizer.optimize(short).expect("optimize failed");

    let long = "This is a much longer piece of text with many words to test the token counting. ".repeat(10);
    let long_result = optimizer.optimize(&long).expect("optimize failed");

    // Longer text should have more tokens
    assert!(long_result.original_tokens > short_result.original_tokens);
}

#[test]
fn test_optimizer_with_cargo_error() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");

    let cargo_error = r#"
   Compiling myapp v0.1.0
error[E0425]: cannot find value `unknown_var` in this scope
   --> src/main.rs:42:5
    |
 42 |     unknown_var = 42;
    |     ^^^^^^^^^^^ not found in this scope

error: aborting due to 1 previous error
    "#;

    let result = optimizer.optimize(cargo_error).expect("optimize failed");

    // Should detect as log
    assert_eq!(result.content_type, ContentType::Log);

    // Should keep error lines
    assert!(result.compressed.contains("error[E0425]"));
    assert!(result.compressed.contains("src/main.rs:42"));

    // Should drop compilation noise
    assert!(!result.compressed.contains("Compiling myapp"));
}

#[test]
fn test_optimizer_real_world_scenario() {
    let optimizer = ContextOptimizer::new().expect("failed to create optimizer");

    // Simulate a chunk from a real failure log with mixed content
    let mixed_content = r#"
2026-08-28T09:15:00Z DEBUG: Starting npm install
npm WARN deprecated info@0.8.0: package no longer supported
npm notice created a lockfile
npm WARN optional SKIPPING OPTIONAL DEPENDENCY
2026-08-28T09:15:05Z INFO: dependency resolution
npm ERR! 404 Not Found - GET https://registry.npmjs.org/react@99.0.0
npm ERR! 404
npm ERR!  It is likely you are behind a proxy
npm ERR! A complete log: /home/user/.npm/_logs/error.log
2026-08-28T09:15:10Z WARN: slow network
    "#;

    let result = optimizer.optimize(mixed_content).expect("optimize failed");

    // Should detect as log (has timestamps + errors)
    assert_eq!(result.content_type, ContentType::Log);

    // Should reduce size
    assert!(result.compressed.len() < mixed_content.len());

    // Should preserve critical information
    assert!(result.compressed.to_lowercase().contains("npm err!"));
    assert!(result.compressed.contains("404"));
    assert!(result.compressed.contains("2026-08-28")); // Timestamps may be kept
}